It has emerged that the authorities were warned about Amri nine months before

But now a letter has surfaced written in March last year to the ministry of the interior of the state parliament in Duesseldorf which stated: “Amri presents a threat in the form of a suicide attack. The commission of a terrorist attack by Amri is expected.”

The letter went on to suggest deporting him and contained evidence of a tapped phone conversation in he had in February in which Amri used the word ‘Dougma’ – a metaphor, say German spies, that Islamists use to mean a suicide bombing.

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Dozens of market-goers were also injured by the lorry used by the terrorist

Even after the attack, regional Interior Minister Ralf Jäger several times said it was not “legally possible” to order a deportation.

The new details are a further embarrassment to the government whose intelligence services are struggling to contain terror threats from Islamic fanatics who smuggled themselves into the country disguised as refugees.

Jäger, a left wing politician, has been blasted as a security risk for Germany by rival conservatives for failing to pass on the details of the threat.

Armin Laschet, chief of the CDU conservatives in the state, said: “He presents a risk for everyone in Germany.” The Liberal FDP party is calling for his resignation.

Jäger will testify before a parliamentary committee of inquiry on Wednesday about his failure to act on the police warning.

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